Yes, there is such a thing as a free lunch at Pastoral's Artisan Producer Festival, where you can meet more than 70 small-batch culinary artists, brewers and vintners from around the globe, browse their offerings and taste samples of their cheeses, charcuterie, confections, spirits and more. 11 a.m.-3 p.m. Saturday.

The quest for booze and brains continues at pH Productions' fifth annual Chicago Zombie Pub Crawl, where you stop for crawl-only specials at six bars including Simon's, Hamburger Mary's and The Call. Admission includes a souvenir T-shirt, keepsake cup and the opportunity to horrify and delight unsuspecting passersby. 2-9 p.m. Saturday. $25. RSVP required: chicagozombiepubcrawl.com.

Meet reps from nearly 100 charitable organizations at the fifth annual Global Activism Expo, where you also can attend panels, contribute to a community mural, play a "Simon Says" game with kids in India via video chat, watch six world music acts and more. Noon-6 p.m. Saturday. RSVP for door prize: wbez.org/expo.